Yep bare as a badgers bum
OK could you start Firefox in safe mode please and then check for redirects/alerts http://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
If the are none then re-enable the add ons one at a time checking between each for alerts
When you find the one causing them could you let me know what it is
Attached is what I could find for addons.
I enabled each of them one by one and tested them with searches and no alerts from avast.
I even enabled both of them at the same time and searched with no alerts from avast.
What do you think?
OK now go back to a normal Firefox - do the alerts resume ?
If they do we will have to fully uninstall Firefox
I opened normal firefox and I see this extra addon, “Mozilla Safe Browsing”.
When I open and do not disable this addon when searching the alert pops up.
When I open and disable this addon then search the alert does not pop up.
Does this help?
OK lets kill that - a good name …not
Warning This fix is only relevant for this system and no other, using on another computer may cause problems
Be advised that when the fix commences it will shut down all running processes and you may lose the desktop and icons, they will return on reboot
Run OTL
[*]Under the Custom Scans/Fixes box at the bottom, paste in the following
https://dl.dropbox.com/u/73555776/OTL_Fix.GIF
:OTL [2012/07/30 19:39:18 | 000,000,000 | ---D | M] (Mozilla Safe Browsing) -- C:\DOCUMENTS AND SETTINGS\X\LOCAL SETTINGS\APPLICATION DATA\{25F8BB85-DAA8-11E1-8270-B8AC6F996F26} FF - HKEY_CURRENT_USER\software\mozilla\Firefox\Extensions\\{25F8BB85-DAA8-11E1-8270-B8AC6F996F26}: C:\Documents and Settings\x\Local Settings\Application Data\{25F8BB85-DAA8-11E1-8270-B8AC6F996F26}\ [2012/07/30 19:39:18 | 000,000,000 | ---D | M]:Files
ipconfig /flushdns /c:Commands
[purity]
[resethosts]
[emptytemp]
[CREATERESTOREPOINT]
[Reboot]
Here’s the log after the quickscan!
Can you spot anything?
The main element has gone, but I will have to pick the second apart… Are the alerts now history ?
Warning This fix is only relevant for this system and no other, using on another computer may cause problems
Be advised that when the fix commences it will shut down all running processes and you may lose the desktop and icons, they will return on reboot
Run OTL
[*]Under the Custom Scans/Fixes box at the bottom, paste in the following
https://dl.dropbox.com/u/73555776/OTL_Fix.GIF
:Reg [HKEY_CURRENT_USER\software\mozilla\Firefox\Extensions] {25F8BB85-DAA8-11E1-8270-B8AC6F996F26}=-:Files
C:\Documents and Settings\x\Local Settings\Application Data{25F8BB85-DAA8-11E1-8270-B8AC6F996F26}:Commands
[Reboot]
Here is the quick scan after the last script, not experiencing any problems with alerts now!
What do you think?
I think that you should be good to go ;D
Now that was a fun exercise trying to track it down
Subject to no further problems 
I will remove my tools now and give some recommendations, but, I would like you to run for 24 hours or so and come back if you have any problems
Now the best part of the day ----- Your log now appears clean 
A good workman always cleans up after himself so…The following will implement some cleanup procedures as well as reset System Restore points:
Run OTL
[*]Under the Custom Scans/Fixes box at the bottom, paste in the following
:Commands [resethosts] [emptyjava] [emptyflash] [CLEARALLRESTOREPOINTS] [Reboot]
[*]Then click the Run Fix button at the top
[*]Let the program run unhindered, reboot the PC when it is done
Remove ComboFix
[*]Hold down the Windows key + R on your keyboard. This will display the Run dialogue box
[*]In the Run box, type in ComboFix /Uninstall
(Notice the space between the “x” and “/”)
then click OK
http://i1224.photobucket.com/albums/ee362/Essexboy3/Misc%20screen%20shots/CF_Uninstall-1.jpg
[]Follow the prompts on the screen
[]A message should appear confirming that ComboFix was uninstalled
Run OTL and hit the cleanup button. It will remove all the programmes we have used plus itself.
We will now confirm that your hidden files are set to that, as some of the tools I use will change that
[*]Click Start.
[*]Open My Computer.
[*]Select the Tools menu and click Folder Options.
[*]Select the View Tab.
[*]Under the Hidden files and folders heading select Do not show hidden files and folders.
[]Click Yes to confirm.
[]Click OK.
http://users.telenet.be/bluepatchy/miekiemoes/images/javaicon.gif
Your Java is out of date.
Older versions have vulnerabilities that malware can use to infect your system.
Please follow these steps to remove older version of Java components and upgrade the application.
Upgrading Java:
[] Go to this site and click Do I have Java
[] It will check your current version and then offer to update to the latest version
Now that you are clean, to help protect your computer in the future I recommend that you get the following free programmes:
http://img233.imageshack.us/img233/7729/mbamicontw5.gif
Malwarebytes.
Update and run weekly to keep your system clean
Download and install FileHippo update checker and run it monthly it will show you which programmes on your system need updating and give a download link
It is critical to have both a firewall and anti virus to protect your system and to keep them updated. To keep your operating system up to date visit
[*]Microsoft Windows Update
To learn more about how to protect yourself while on the internet read our little guide How did I get infected in the first place ?Keep safe 